For me....I work in an open office. We all have headsets. However, I don't wear the headset until I receive a call. With Skype there is a gentle but noticeable ringtone on the speaker of the computer. Once I answer the call the speaker and microphone are both via the headset and the volume of all three (ringtone, headset speaker, and headset microphone are INDEPENDENTLY adjustable.

It's not uncommon to have multiple audio sources playing at the same time on my PC. Being able to drop the volume on Teams so I can focus listening to something else is critical. Please add a volume control inside of Teams

I'd like to put support behind this idea. For some strange reason when in a Teams call, the volume is at incredibly high levels and there is no way to control it. It does not honor system volume controls either, so turning the sound down in Windows Volume Mixer nearly destroys my eardrums.